737 MAX Flight Crew Operations Manual
Hydraulics -
Controls and Indicators
MN-FLT-OH-201
13.10.5
2
Flight Control LOW PRESSURE Lights
Illuminated (amber) –
• indicates low hydraulic system (A or B) pressure to ailerons, elevator
and rudder
• deactivated when associated FLIGHT CONTROL switch is positioned
to STBY RUD and standby rudder shutoff valve opens.
3
STANDBY HYDRAULIC LOW QUANTITY Light
Illuminated (amber) –
• indicates low quantity in standby hydraulic reservoir
• always armed.
4
STANDBY HYDRAULIC LOW PRESSURE Light
Illuminated (amber) –
• indicates output pressure of standby pump is low
• armed only when standby pump operation has been selected or
automatic standby function is activated.
5
STBY RUD ON Light
Illuminated (amber) - indicates the electric motor driven standby pump is
commanded on to pressurize the standby rudder PCU (Power Control Unit).
6
ALTERNATE FLAPS Master Switch
OFF (guarded position) – normal operating position.
ARM – closes trailing edge flap bypass valve, activates standby pump, and arms
ALTERNATE FLAPS position switch.
March 1, 2021